Keith,
The fact you're using PHP shouldn't matter - I do it the same way on my PHP pages as I do on static HTML pages. You need to use a combination of JS and cookies.
I suppose if you didn't want to use JS or Cookies you could do something with session variables, but I'd say it's overkill really -
Make your pop up set a session variable
Make every other page check for the session variable being set
If the variable is set then don't do the pop-up and if it isn't do it.
Ian
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